In a food processor or blender, puree the strawberries until smooth. If desired, pass the strawberry puree through a sieve to remove the seeds, and then return the puree to the food processor. Add the remaining ingredients and process for 1-2 minutes or until light and creamy. Transfer the strawberry mousse to a glass bowl, cover, and chill for 1 hour. Top individual servings with additional sliced strawberries or other fruit, granola, or nuts.